Fig. 7.
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Variation of the HRM best focus position in coarse and fine focus (in units of λ) along the orbit of SO from 5 November 2021 to 22 March 2022. The curves correspond to the best-fit quadratic function of both types of focus. The y-scaling is chosen such that the HRM best focus position at the absolute maximum of the quadratic fit is equal to zero.
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